Release spring lock connector on air conditioning line.  For separating spring lock air-conditioning refrigerant pressure lines on 1981 – current Ford cars and Pick-Ups with spring lock connection.  They are spring-loaded in the closed position to deflect any spray that occurs when the line is disconnected.
Color-coded:
Red: 3/8”、 Blue: 1/2”、 Black: 5/8”、Vanilla: 3/4”